[Lex Computer & Tech Group/LCTG] Fusion

Thu Mar 24 19:54:37 PDT 2022

Maybe I misunderstand the last part of Larry’s post:  beryllium and lithium are rather common elements.  Maybe there are special requirements – purity, for example?
Is it possible that some beryllium (Be) and lithium compounds would be suitable for the neutron multipliers?  Pure lithium oxidizes easily, so a stable compound might have practical advantages.  Beryllium is stable, but BeO might be less expensive (I don’t know).
A side note: Be is very poisonous, damaging the lungs.  When I did an NMR study of Be, the powder sample was encased in a very heavy-duty glass tube.  A special facility had manufactured the sample (one wouldn’t buy it on Amazon, I think … although I haven’t checked).
    – Mike Alexander

On Thursday, March 24, 2022, 12:33 PM, L Wittig <9423lew at gmail.com> wrote:

I watched Rein’s presentation (not the Q&A).  He spent a fair amount of time talking about how plentiful and cheap deuterium is. Indeed you can get it from water by simple electrolysis. It could hardly be any cheaper. But he didn't talk about tritium, which is more complicated.  If you wanted to buy it it costs ~$300,000/gram and has a 12 yr half life; probably the most expensive material on earth bar none. (https://en.wikipedia.org/wiki/Tritium#:~:text=As%20of%202000%2C%20commercial%20demand,approximately%20US%2430%2C000%20per%20gram. ) The cost is high because it is a byproduct of breeder reactors. HOWEVER for use for fusion it can be breed inside the reactor by bombardment of beryllium and lithium. Fortunity, there is a lot of research on this (MIT/CFS don't have to develop it.) It does mean you need to procure beryllium and lithium which is a more expensive process than  procuring deuterium. Beryllium and lithium blankets for fusion reactors are discussed here starting about one-fourth of the way down: https://www.fusion.qst.go.jp/rokkasyo/en/project/blanket.html

On Thu, Mar 24, 2022 at 8:14 AM john rudy <jjrudy1 at comcast.net> wrote:

85 minutes

John Rudy

781-861-0402

781-718-8334 (cell)

John.rudy at alum.mit.edu 

13 Hawthorne Lane

Bedford, MA  01730-1047

From: Robert Primak <bobprimak at yahoo.com> 
Sent: Thursday, March 24, 2022 6:03 AM
To: Lex Computer Group <lctg at lists.toku.us>; john rudy <jjrudy1 at comcast.net>
Subject: Re: [Lex Computer & Tech Group/LCTG] Fusion

We haven't had a session on fusion in awhile. Would this update take a whole session? Are there any other items to group with this topic?

-- Bob Primak

On Wednesday, March 23, 2022, 07:55:22 PM EDT, john rudy <jjrudy1 at comcast.net> wrote: 

Here is Rein’s recent Fusion talk.  It is fascinating.  Start at about 7 mins after the stuff dealing with my class and out reunion

John

https://1967.alumclass.mit.edu/s/1314/2015/club-class-main.aspx?sid=1314&gid=58&pgid=60177

John Rudy

781-861-0402

781-718-8334 (cell)

John.rudy at alum.mit.edu 

13 Hawthorne Lane

Bedford, MA  01730-1047

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